Oil-fired-furnace extension.



G. W. GOEN.

OIL FIRED FURNACE EXTENSION.

APPLICATION FILED APR, 1, 1914.

LWWWL Patented Feb. 23, 1915.

\VITNESSES: INVESTOR wearer..

it At GARNET W. COEN, SAN FRANCISCO, CALIFORNIA.

OIL-FIRED-FURNACE EXTENSION.

Specification of Letters Patent.

Patented Feb. 23,1915.

Application filed April 1, 1914. Serial No. 828,785.

To all whom it may concern-.-

' specification.

This invention relates to oil fired furnace extensions, or asis sometimes called Dutch oven extensions for oil fired furnaces.

The object of the invention is to produce an extension of this naturethatwill insure an absolutely uniform supplyof oxygen tothe atomized fuel in such a manner as to producerapid combustion in the front end of the furnace, with a minimum excessof oxygen, and at the same time prevent heat losses from radiation and reflection through the extension; also to provide means for controlling the air supply and guiding it in sucha manner as to compel the oxygen of the air' to thoroughly mix with the atomized fuel immediately upon its release from'the burner' tip, and at a point where suflicient heat is stored up to ignite the mixture.

Another'o'bject of the-invention is to provide a novel construction which permits two different and distinct supplies of air to be admitted to the furnace,.a primary and a secondary supply, each separately con trolled and so directed asto compel the air currents to come into contact with the atomized fuel from a direction substantially at right angles to the flow of the latter.

Another object is to provide means for preventing the extension properfrom being exposed to the heat rays or radiation of the furnace, thus insuring a comparatively cool extension, and preventing heat losses 1n this manner. a r

A further object is to provide a deflecting flange in closeproximity to the burner t p; this flan e performing two important duties, viz: it rst deflects the course of the primary air, causing air currents to eddy against the face of the flange and combine with the fuel immediately'upon its release from the burner; secondly, it acts asa heat reservoir radiating sufficientheat to ignite the combined carbon and oxygen in close proximity to the face of the flange.

The invention consists of the parts and the construction and combination of parts as hereinafter more fully described and claimed, having reference to the accom-v panying drawings in which- Figure lrepresents a front elevation of the oil fired furnace extension. Fig. 2 is a" sectional side elevation of the extension, showing its application to a furnace of a Scotch marine boiler, said section being taken on line XX, Fig. 1. I

Referring to the drawings, A indicates in general the forward end of a suitable form of furnace, and B the'furnace extension as applied. The furnace extension proper consists first, of an exterior, annular casing section 2, which may be suitably secured as at 3 to the furnace front. Concentrically positioned with relation to the outer casing is an interior casing' i, and lining the inner surface of same as at 5is a suitable form of refractory material. Secured to the front end of the outer casing section as at 6, is a front plate 7 in which is formed a central opening 8, and a plurality of radially disposed openings 9. The openings 9 communicate with an exterior annular air duct 10,

while opening 8 communicates with a central air passage 11. Suitably secured on, the outer end of the inner casing section is a spider bracket 12, andcarried by said bracket is a pipe section 13, on the inner end of which is secured a flange 14.= Mounted on the outer end of pipe 13, exterior of the front plate 7 is a primary air damper 15,

which is slidably mounted with relation to the central opening 8 for the purpose of controlling the admission of air through same. Slidably mounted exterior of theinner casing section is a secondary air dam-per 16; this damper consists of an annular T-shaped ring which is connected through rods 17 with handle 18 through which'it may be moved in or out upon the inner casing section.

The mouth of the furnace opening is, in this instance, lined with a suitable form of refractory material, as indicated at 19, and a central opening 20 of smaller diameter than the exterior of the inner casing section is formed in the refractory material of the furnace. The inner casing section is so positioned as to leave an annular opening between the end of'samc and the face of the furnace, and the area of this opening may be varied to suit conditions by sliding the secondary damper in or out with relation to the furnace.

For the purpose of preventing the escape of reflected or radiated heat through the annular, exterior air duct an inclined deflect-j ing flange 21 is provided; this is secured in a suitable position with relation toopenings burner. Under normal draft conditions it is desirable .to leave the, primary damper partly open, as indicated in Fig. 2; this permits the. airto enter through the central opening 8 in the. direction. of the arrows.

Thecentralinwardly passing air current is,

v however,'broken up to a certain. extent by strikingthe rear face ofv flange 14,.this producing more or less of an eddy in front of therflange, which causes the fuel and air to thoroughly mix at this point. .Air is also permitted to enter through the radial openings 9 in. the direction of the arrows. The air is here deflected outwardly in the direction of arrows a against the interior surface of the exterior casing section; it then passes down inthe-direction of arrows b between the secondary damper and the front face of thefurnace. The air thus admitted to the flame area of the furnace, practically speaking, in front of the nozzle of the burner enters at right angles fromall directions and is. forced into contact with the atomized 0il,-;thus further assisting to produce a perfect mixture ofthe -:fuel; and oxygen. The volume of air entering at right angles from the exterior, annular air duct may be easily regulated in volume and velocity by changing the position of the secondarydamper. The air admitted; through the center opening may-similarly be controlledbysliding the primary damper in andout; on pipe .12 with relation to the central, opening, handles 23 being provided for this purpose. The an- .nular deflecting plate, indicated at 21, not only preventsanyreflect d heat fromescaping through the furnace extension, but. also directs the, airup into contact. with the ex-.

terior casing. Thislkeeps the exterior casing and, front plate cool and prevents loss of heat in' this direction. pFlange 14 not only serves the purpose of a deflector for the primary air, current, but also acts as a heat reservoir. It has been found during actual practice that the flange becomes. intensely hot. This not only .heats the air which passes around same, bntalso raises thetems perature of the oil to the flashing point.

The materials and finish of the several {parts of the extension are such as the experience and judgment of the manufacturer may dictate.

I wish it understood that various change in form, proportions and minor details of construction may be resorted to within the I claim and desire to secure by Letters Patcut is- 1. In a deviceof the character described,

the combination of an exterior casing, an interior casing connected therewith, said casings forming a central primary air passage and an exterior, annular secondary air passage, a pipe supported centrally within the interior casing, a flange on the inner end of said pipe, a' damper slidable on said pipe with relation to the primary air assage, and means for regulating the flow 0 air through the secondary passage.

' 2. In a device of the character described, the combination of an exterior easing, an interior casing connected therewith, said casings forming a central primary air passage and an exterior, annular secondary air passage, a pipe supported centrally within the interior casing, a flange on the inner end of said pipe, a damper slidable on said pipe with relation to the primary air passage, and

a ring slidably mounted exterior of the inner. casing to control the flow of air through the secondary passage.

3. The combination with a furnace, of an exterior casing secured thereto, an interior casing secured within the exterior casing, and spaced with relation thereto and the front of the furnace, means for admitting air to the furnace through the interior casing and the exterior thereof, means for regulating the flow of air through the interior casing, and a damper ringslidable on the in terior casing, said damper being adapted to regulate the space between the end of the interiorv casing and the furnace face.

4. A furnace extension, comprising in combination, an exterior casing, an interior casing, said casing forming a central pri--' mary air passage and an exterior, annular,

secondary passage, a front plate secured to the outer end of said casing sections, said plate having a central opening formed therein which communicates with the primary air passage and a plurality of radially disposed openings which communicate with the secondary air passage, an annular deflecting which ,communicates with the primary air passage and a plurality of radially disposed openings which communicate with the secondary air passage, an annular deflecting flange surrounding the interior casing, a

pipe supported centrally within the interior casing, a flan e on the inner end of said pipe, and means or regulating the flow of air through the primary passage.

6. A furnace extension, comprising in combination, an exterior casing, an interior casing, said casingsforming a central primary air passage and an exterior, annular, secondary passage, a front plate secured to the outer end of said casing sections, said plate having a central opening formed therein which communicates with the primary air passage and a plurality of radially disposed openings which communicate with the secondary air passage, an annular deflecting flange secured to the interior casing, a pipe supported centrally within the interior casing, a flange on the inner end of said pipe, and a damper plate slidable on said plpe with relation to the opening in the primary air passage. v

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

GARNET W. COEN.

Witnesses:

JOHN H. HERRING, W. W. HEALEY. 

